Undead Labs, the developer behind 2013's breakout XBLA hit State of Decay, has extended its agreement with Microsoft Studios.

The new deal is a "multi-year, multi-title agreement" with Microsoft Studios that, reading between the lines, is almost certain to see new titles from Undead Labs continue to be exclusive to Microsoft platforms.

And it seems they are hard at work on something. In the blog post announcing the contract with Microsoft the developer promises to "share details later this year, but as with State of Decay, we think it’s best if we just keep our heads down and build some prototypes before we talk too much. For now, suffice it to say there are big things going on with State of Decay."